CN113108439A - Control method and device of air conditioner, air conditioner and storage medium - Google Patents

Control method and device of air conditioner, air conditioner and storage medium Download PDF

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Publication number
CN113108439A
CN113108439A CN202110551475.XA CN202110551475A CN113108439A CN 113108439 A CN113108439 A CN 113108439A CN 202110551475 A CN202110551475 A CN 202110551475A CN 113108439 A CN113108439 A CN 113108439A
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China
Prior art keywords
air conditioner
temperature
opening degree
indoor
expansion valve
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CN202110551475.XA
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Chinese (zh)
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CN113108439B (en
Inventor
李金波
吴延平
邱向伟
戚文端
郑立宇
杜顺开
杨泾涛
高�浩
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GD Midea Air Conditioning Equipment Co Ltd
Guangdong Meizhi Compressor Co Ltd
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GD Midea Air Conditioning Equipment Co Ltd
Guangdong Meizhi Compressor Co Ltd
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Priority to CN202110551475.XA priority Critical patent/CN113108439B/en
Publication of CN113108439A publication Critical patent/CN113108439A/en
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Publication of CN113108439B publication Critical patent/CN113108439B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F24F11/67—Switching between heating and cooling modes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature

Abstract

The invention relates to the technical field of air conditioners, and discloses a control method and a control device of an air conditioner, the air conditioner and a storage medium, wherein the method comprises the following steps: when the air conditioner is in a refrigeration mode, acquiring the current running frequency of a compressor; when the current operating frequency reaches the minimum limit frequency, judging whether the indoor temperature of the indoor environment where the air conditioner is located is lower than a set temperature; when the indoor temperature of the indoor environment where the air conditioner is located is lower than the set temperature, the opening degree of the first electronic expansion valve is increased, the opening degree of the second electronic expansion valve is reduced, the pressure of a refrigerant between the outdoor heat exchanger and the flash evaporator is reduced, the flow of the refrigerant at the indoor heat exchanger is reduced, and therefore the liquid refrigerant entering the indoor heat exchanger is reduced, the actual requirement is matched with the output cold load of the air conditioner better, the compressor of the air conditioner is guaranteed to maintain stable indoor temperature under the non-stop state, meanwhile, the risk of liquid return is reduced, the reliability of the system is enhanced, and the purpose of improving the comfort of users is achieved.

Description

Control method and device of air conditioner, air conditioner and storage medium
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and device of an air conditioner, the air conditioner and a storage medium.
Background
When the air conditioner is operated in a refrigerating mode at present, the operation frequency of the air conditioner can be reduced due to low indoor and outdoor cold and heat loads when the air conditioner operates at night or with low temperature difference, when a compressor of the air conditioner operates to the lowest frequency, the air conditioner outputs the cold load to enable the indoor temperature to continuously drop until the indoor temperature reaches or is lower than the temperature set by a user, so that the air conditioner is stopped at the reaching temperature, after the air conditioner is stopped at the reaching temperature, the indoor temperature gradually rises until the air conditioner is started again to operate when the indoor temperature is higher than the temperature set by the user, so that the air conditioner is stopped at the reaching temperature frequently during the refrigerating operation, and the air conditioner frequently stops at the reaching temperature to cause the fluctuation of the indoor temperature, so that uncomfortable experience is brought to the user.
Disclosure of Invention
The invention provides a control method and device of an air conditioner, the air conditioner and a storage medium, and aims to solve the technical problem of indoor temperature fluctuation caused by frequent temperature reaching and shutdown of the air conditioner during refrigeration operation.
In order to achieve the purpose, the invention provides a control method of an air conditioner, wherein the air conditioner comprises a compressor, an outdoor heat exchanger, a flash evaporator and an indoor heat exchanger which are sequentially connected, a first electronic expansion valve is arranged between the outdoor heat exchanger and the flash evaporator, a second electronic expansion valve is arranged between a liquid phase outlet of the flash evaporator and the indoor heat exchanger, the compressor comprises a first air cylinder and a second air cylinder which are mutually independent, a gas return port of the first air cylinder is communicated with the indoor heat exchanger, and a gas return port of the second air cylinder is communicated with a gas phase outlet of the flash evaporator; the method comprises the following steps:
when the air conditioner is in a refrigeration mode, acquiring the current running frequency of the compressor;
when the current operating frequency reaches the minimum limit frequency, judging whether the indoor temperature of the indoor environment where the air conditioner is located is lower than a set temperature; and the number of the first and second groups,
and when the indoor temperature of the indoor environment of the air conditioner is lower than the set temperature, increasing the opening degree of the first electronic expansion valve and reducing the opening degree of the second electronic expansion valve so as to reduce the pressure of the refrigerant between the outdoor heat exchanger and the flash evaporator and reduce the flow of the refrigerant at the indoor heat exchanger.
Alternatively, the opening degree of the first electronic expansion valve is increased by a first target opening degree, and the opening degree of the second electronic expansion valve is decreased by a second target opening degree.
And after the preset time, returning to the step of judging whether the indoor temperature of the indoor environment where the air conditioner is located reaches the preset indoor temperature condition.
Optionally, acquiring a target pressure difference of the air conditioner and a current operating frequency of the compressor;
and determining a first target opening degree and a second target opening degree according to the target pressure difference and the current operation frequency.
Alternatively, the opening degree of the first electronic expansion valve is increased in a stepwise manner and the opening degree of the second electronic expansion valve is decreased in a stepwise manner within a preset time.
Optionally, when the indoor temperature of the indoor environment where the air conditioner is located is greater than the set temperature, the air conditioner is controlled to continuously operate according to the current operation parameters.
Optionally, when the indoor temperature of the indoor environment in which the air conditioner is located is less than a set temperature and the opening degree of the second electronic expansion valve reaches a minimum limit opening degree, the opening degree of the first electronic expansion valve is decreased.
Optionally, acquiring an outdoor temperature of an outdoor environment where the air conditioner is currently located and an indoor temperature of an indoor environment where the air conditioner is currently located;
determining a target exhaust temperature interval according to the outdoor temperature and the indoor temperature;
and when the exhaust temperature of the compressor exceeds the target exhaust temperature interval, adjusting the opening degree of the first electronic expansion valve and/or the second electronic expansion valve until the exhaust temperature of the compressor is in the target exhaust temperature interval.
In order to achieve the above object, the present invention also provides a control device for an air conditioner, comprising:
the acquisition module is used for acquiring the current running frequency of the compressor when the air conditioner is in a refrigeration mode;
the judging module is used for judging whether the indoor temperature of the indoor environment where the air conditioner is located is lower than a set temperature or not when the current running frequency reaches the minimum limit frequency; and the number of the first and second groups,
and the regulation and control module is used for increasing the opening degree of the first electronic expansion valve and reducing the opening degree of the second electronic expansion valve when the indoor temperature of the indoor environment where the air conditioner is located is lower than a set temperature, so as to reduce the pressure of the refrigerant between the outdoor heat exchanger and the flash evaporator and reduce the flow of the refrigerant at the indoor heat exchanger.
In addition, in order to achieve the above object, the present invention further provides an air conditioner, which includes a processor, a memory, and a control program of the air conditioner stored in the memory, wherein when the control program of the air conditioner is executed by the processor, the steps of the control method of the air conditioner as described above are implemented.
In addition, to achieve the above object, the present invention also provides a computer storage medium having a control program of an air conditioner stored thereon, the control program of the air conditioner implementing the steps of the control method of the air conditioner as described above when being executed by a processor.
Compared with the prior art, the invention provides the control method of the air conditioner, which is characterized in that when the air conditioner is in a refrigeration mode, the current running frequency of the compressor is obtained; when the current operating frequency reaches the minimum limit frequency, judging whether the indoor temperature of the indoor environment where the air conditioner is located is lower than the set temperature; when the indoor temperature of the indoor environment where the air conditioner is located is lower than the set temperature, the opening degree of the first electronic expansion valve is increased, the opening degree of the second electronic expansion valve is reduced, the refrigerant pressure between the outdoor heat exchanger and the flash evaporator is reduced, the refrigerant flow at the indoor heat exchanger is reduced, the liquid refrigerant entering the indoor heat exchanger is reduced by reducing the refrigerant pressure between the outdoor heat exchanger and the flash evaporator and reducing the refrigerant flow between the flash evaporator and the indoor heat exchanger, the output cold load of the air conditioner is matched with the actual requirement, the compressor of the air conditioner is guaranteed to maintain stable indoor temperature under the non-stop state, the risk of liquid return is reduced, the reliability of the system is enhanced, and the purpose of improving the comfort of users is achieved.
Drawings
Fig. 1 is a schematic diagram of a hardware configuration of an air conditioner according to embodiments of the present invention;
FIG. 2 is a schematic flow chart of a first embodiment of a control method of an air conditioner according to the present invention;
fig. 3 is a schematic structural view of an air conditioner according to a control method of the air conditioner of the present invention;
FIG. 4 is a flowchart illustrating a second embodiment of a method for controlling an air conditioner according to the present invention;
FIG. 5 is a flow chart illustrating a control method of an air conditioner according to a third embodiment of the present invention;
FIG. 6 is a flow chart illustrating a fourth embodiment of a control method of an air conditioner according to the present invention;
fig. 7 is a functional block diagram of an embodiment of the control device of the air conditioner of the present invention.
Description of the drawings:
reference numerals Name (R) Reference numerals Name (R)
1 Compressor 5 Second electronic expansion valve
1-1 Independent compression compressor reservoir 6 Indoor heat exchanger
2 Outdoor heat exchanger 7 First sensor
3 First electronic expansion valve 8 Second sensor
4 Flash evaporator
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic diagram of a hardware structure of an air conditioner according to embodiments of the present invention. In this embodiment of the present invention, the air conditioner may include a processor 1001 (e.g., a cpu 35ntr1l Pro35ssin7 Unit, 3 PU), a communication bus 1002, an input port 1003, an output port 1004, and a memory 1005. The communication bus 1002 is used for realizing connection communication among the components; the input port 1003 is used for data input; the output port 1004 is used for data output, the memory 1005 may be a high-speed R1M memory, or may be a non-vol1til 5m 5 memory, such as a magnetic disk memory, and the memory 1005 may optionally be a storage device independent of the processor 1001. Those skilled in the art will appreciate that the hardware configuration depicted in FIG. 1 is not intended to be limiting of the present invention, and may include more or less components than those shown, or some components in combination, or a different arrangement of components.
With continued reference to fig. 1, the memory 1005 of fig. 1, which is one of the readable storage media, may include an operating system, a network communication module, an application program module, and a control program of the air conditioner. In the terminal shown in fig. 1, the network interface 1004 is mainly used for connecting to a backend server and performing data communication with the backend server; the user interface 1003 is mainly used for connecting a client (user side) and performing data communication with the client; and the processor 1001 may be used to call up a control program of the air conditioner stored in the memory 1005.
In this embodiment, the control device of the air conditioner includes: a memory 1005, a processor 1001, and a control program of the air conditioner stored in the memory 1005 and operable on the processor 1001, wherein when the processor 1001 calls the control program of the air conditioner stored in the memory 1005, the following operations are performed:
when the air conditioner is in a refrigeration mode, acquiring the current running frequency of the compressor;
when the current operating frequency reaches the minimum limit frequency, judging whether the indoor temperature of the indoor environment where the air conditioner is located is lower than a set temperature; and the number of the first and second groups,
and when the indoor temperature of the indoor environment of the air conditioner is lower than the set temperature, increasing the opening degree of the first electronic expansion valve and reducing the opening degree of the second electronic expansion valve so as to reduce the pressure of the refrigerant between the outdoor heat exchanger and the flash evaporator and reduce the flow of the refrigerant at the indoor heat exchanger.
Based on the hardware structure shown in fig. 1, a control method of an air conditioner is provided in a first embodiment of the present invention, referring to fig. 2, and fig. 2 is a flowchart illustrating the control method of the air conditioner in the first embodiment of the present invention.
While a logical order is shown in the flow chart, in some cases, the steps shown or described may be performed in a different order than that shown or described herein.
It should be noted that, the air conditioner may refer to an independent compression air conditioner, in other words, the compressor of the air conditioner in this embodiment is an independent compression compressor, that is, an independent compression cylinder is further disposed in the compressor, compression processes of a main cylinder of the compressor and the independent compression cylinder are independent from each other, and respectively compressed gases are discharged into a casing of the compressor and mixed to enter a heat exchanger of the air conditioner together, so as to achieve the purposes of improving power consumption of the compressor and heat exchange efficiency, and greatly improving energy efficiency of the compressor and system energy efficiency.
Specifically, referring to fig. 3, as shown in the schematic diagram of the air conditioner shown in fig. 3, the air conditioner may include a compressor 1 including a first cylinder and a second cylinder which are independent of each other, an independent compression compressor reservoir 1-1 for gas-liquid separation, an outdoor heat exchanger 2 (i.e., a condenser) for dissipating heat from a refrigerant, a first electronic expansion valve 3, a flash evaporator 4 for separating a gaseous refrigerant and a liquid refrigerant, a second electronic expansion valve 5, an indoor heat exchanger 6 (i.e., an evaporator) for absorbing heat from the refrigerant, a first sensor 7 and a second sensor 8, where a return air port of the first cylinder is communicated with the indoor heat exchanger 6, a return air port of the second cylinder is communicated with a gas phase outlet of the flash evaporator 4, so that the gaseous refrigerant flowing out of the gas phase outlet of the flash evaporator 4 directly flows to the return air port of the second cylinder, and the refrigerant flowing out of the indoor heat exchanger 6 is subjected to gas-liquid compression by the independent compression compressor reservoir 1-1 The separated gaseous refrigerant flows to the air return port of the second cylinder and continues to circulate for refrigeration.
It should be noted that, in this embodiment, the compression forms of the first cylinder and the second cylinder may be both rotary compression and reciprocating and rotary compression, and in this embodiment, the first cylinder and the second cylinder may be flexibly configured according to actual needs, which is not limited thereto.
Referring to fig. 3, the first electronic expansion valve 3 is disposed between the outdoor heat exchanger 2 and the refrigerant inlet of the flash evaporator 4 to regulate the pressure of the liquid refrigerant between the outdoor heat exchanger 2 and the flash evaporator 4, and further regulate the cooling capacity output by the air conditioner during cooling, and the second electronic expansion valve 5 is disposed between the liquid phase outlet of the flash evaporator 4 and the indoor heat exchanger 6 to regulate the refrigerant flow in the indoor heat exchanger 6, and further regulate the cooling capacity of the indoor heat exchanger 6.
For convenience of understanding, in this embodiment, the above-mentioned air conditioner structure is described with reference to the refrigerant flow direction of the air conditioner during the cooling operation, as shown by the arrow in fig. 3, when the air conditioner is in the cooling operation, the operation frequency of the compressor 1 in the current mode is determined according to the temperature set by the user and the outdoor temperature, then the compressor 1 sends a certain flow rate of high-temperature high-pressure gaseous refrigerant to the outdoor heat exchanger 2 at the operation frequency, the high-temperature high-pressure gaseous refrigerant is converted into medium-temperature low-pressure liquid refrigerant after dissipating heat in the outdoor heat exchanger 2, the medium-temperature low-pressure liquid refrigerant is throttled and depressurized by the first electronic expansion valve 3 to become low-temperature low-pressure gas-liquid mixed refrigerant, then the gas-liquid mixed refrigerant is subjected to gas-liquid separation by the flash evaporator 4, the separated gaseous refrigerant directly flows back to the compressor 1 to continue to circulate for cooling, and the, so as to absorb heat and evaporate in the indoor heat exchanger 6 to become gaseous refrigerant, and finally, the gaseous refrigerant flows into the compressor 1 through the independent compression compressor liquid storage device 1-1 to continue to circulate for refrigeration.
It should be noted that, because the refrigerant may have insufficient heat exchange during the heat exchange in the outdoor heat exchanger 2 and the indoor heat exchanger 6, the refrigerant flowing out from the outdoor heat exchanger 2 and the indoor heat exchanger 6 may be in a gas-liquid mixed state, in this embodiment, after the refrigerant flowing out from the outdoor heat exchanger 6 is subjected to the first gas-liquid separation by the flash evaporator 4, the gaseous refrigerant directly flows from the gas-phase outlet of the flash evaporator 4 to the second cylinder of the compressor 1 for the second compression cycle refrigeration, and the liquid refrigerant flowing out from the liquid-phase outlet of the flash evaporator 4 flows to the indoor heat exchanger 6 for heat exchange, because the liquid refrigerant may have insufficient heat exchange in the indoor heat exchanger 6, the refrigerant flowing out from the indoor heat exchanger 6 may be in a gas-liquid mixed state, and when the refrigerant flowing out from the indoor heat exchanger 6 passes through the independent compression compressor reservoir 1-1, the independent compression compressor liquid storage device 1-1 performs gas-liquid separation on the refrigerant, the gaseous refrigerant directly flows into the second cylinder of the compressor 1 to perform re-compression circulating refrigeration, and the liquid refrigerant is left in the independent compression compressor liquid storage device 1-1 to prevent the liquid refrigerant from flowing into the compressor to generate liquid impact.
It should be further noted that, in this embodiment, the first sensor 7 is configured to measure a pressure or a temperature of a high-temperature and high-pressure gaseous refrigerant between the compressor 1 and the outdoor heat exchanger 2, and the second sensor 8 is configured to measure a pressure or a temperature of a low-temperature and low-pressure gaseous refrigerant flowing out from a gaseous refrigerant outlet of the flash evaporator 4, so that when the air conditioner operates in this embodiment, the operating parameter of the flash evaporator 4 is regulated according to the pressures or temperatures measured by the first sensor 7 and the second sensor 8, so as to enable the air conditioner to operate stably.
Specifically, referring to fig. 2, the control method of the air conditioner of the present embodiment includes:
step S10: when the air conditioner is in a refrigeration mode, acquiring the current running frequency of the compressor;
it should be noted that the operation frequency of the compressor of the air conditioner may be monitored in real time when the air conditioner performs a cooling operation, or the operation frequency of the compressor of the air conditioner may be obtained again when the operation state of the air conditioner reaches a certain state, for example, the operation frequency of the compressor of the air conditioner is obtained again when it is monitored that the fluctuation range of the indoor environment temperature is within a specific fluctuation range, and the operation frequency may be determined based on other rules, which is not limited in this embodiment.
Step S20: when the current operating frequency reaches the minimum limit frequency, judging whether the indoor temperature of the indoor environment where the air conditioner is located is lower than a set temperature; and the number of the first and second groups,
it should be noted that, in order to ensure the normal operation of the air conditioner, the compressor should be within a safe frequency range during operation, so the minimum limit frequency in this embodiment may refer to the minimum frequency within the safe frequency range of the current air conditioner, and may also refer to other frequencies within the safe frequency range of the air conditioner, which is not limited herein.
In this step, in order to avoid the air conditioner performing the warm-up shutdown operation, in this embodiment, the indoor temperature needs to be monitored, so as to determine whether to adjust the operation parameter of the air conditioner according to the indoor temperature, in other words, when it is detected that the indoor temperature is lower than the set temperature, it indicates that the cooling load output by the air conditioner has exceeded the cooling load required by the user, that is, it indicates that the electronic expansion valve opening of the air conditioner needs to be adjusted, and then the first electronic expansion valve opening is increased and the second electronic expansion valve opening is decreased.
In addition, in order to avoid the influence on the comfort of the user due to the fluctuation of the indoor temperature caused by frequent regulation and control of the electronic expansion valve, in this embodiment, it may also be detected that the difference between the indoor temperature and the temperature set by the user is greater than or equal to the temperature difference set by the user, and when the indoor temperature is lower than the temperature set by the user, the opening degree of the first electronic expansion valve is increased, and the opening degree of the second electronic expansion valve is decreased, for example, the temperature fluctuation range set by the user is 2 ℃, the indoor temperature of the indoor environment of the current air conditioner is 22 ℃, the temperature set by the user is 26 ℃, i.e., the temperature difference between the two is 4 deg.c, the operating parameters of the air conditioner need to be adjusted, and when the indoor temperature of the indoor environment of the air conditioner is 25 deg.c, and when the temperature difference between the current temperature and the current temperature is 1 ℃, which indicates that the temperature is in the temperature range acceptable by the user, the operation parameters of the air conditioner do not need to be adjusted.
In addition, in order to improve the regulation and control accuracy of the air conditioner, whether the conditions are met or not is detected according to the indoor temperature change trend, specifically, the indoor environment temperature of the outdoor environment where the air conditioner is located, the change trend of the indoor environment temperature and the set temperature of the air conditioner are obtained, after the indoor environment temperature is detected to be lower than the set temperature, the indoor environment temperature can be obtained in real time or periodically within the preset time, and the indoor environment temperature can be marked sequentially. For example, the indoor ambient temperatures T1, T2, T3 Tn can be obtained and labeled sequentially. Where Tn is the indoor environment temperature obtained at the nth time in the obtaining period, and the time interval between the first time and the second time may be set according to actual conditions, for example, the time interval may be set to 30 s.
Further, in this embodiment, after the indoor environment temperatures T1, T2, and T3 to Tn are periodically obtained, the indoor temperature curves corresponding to the indoor environment temperatures T1, T2, and T3 to Tn are drawn, and finally, the variation trend of the indoor environment temperature is determined according to the variation trend of the indoor temperature curves.
Further, in still another embodiment, when the trend of change of the indoor ambient temperature acquired within the above-mentioned preset time is not fixed, namely, the change trend of the indoor temperature curve within the preset time has an ascending trend and a descending trend, the last section of the indoor temperature curve is taken as the variation trend of the indoor environment temperature, for example, 10 indoor environment temperatures are periodically obtained within 5 minutes, the curve trend of the first 2 minutes is in an ascending trend, the curve of the middle 1 minute is in a steady trend, and the curve of the last 3 minutes is in a descending trend after the indoor temperature curve corresponding to the 10 indoor environment temperatures is drawn, judging the trend of the change trend of the indoor environment temperature to be lower, when the indoor environment temperature is detected to be lower than the set temperature, and when the variation trend of the indoor environment temperature is in a descending trend, the opening degree of the electronic expansion valve of the air conditioner needs to be adjusted.
In an application scenario, when the indoor temperature is greater than or equal to the set temperature, or is less than the set temperature, but the difference between the indoor temperature and the user-set temperature is less than the user-set temperature difference, or is less than the set temperature, but the trend of the change of the indoor environment temperature is up-down, it indicates that the adjustment of the opening of the electronic expansion valve of the air conditioner is not needed currently, the air conditioner continues to operate at the current opening of the electronic expansion valve, and after operating for a period of time, the step of obtaining the current operating frequency of the compressor is repeatedly executed again, and the subsequent steps are continuously executed, which is not described herein again.
Step S30: and when the indoor temperature of the indoor environment of the air conditioner is lower than the set temperature, increasing the opening degree of the first electronic expansion valve and reducing the opening degree of the second electronic expansion valve so as to reduce the pressure of the refrigerant between the outdoor heat exchanger and the flash evaporator and reduce the flow of the refrigerant at the indoor heat exchanger.
In the step, when the condition is reached, the current cold load output by the air conditioner is indicated to exceed the cold load required by a user, namely, the operation parameter of the air conditioner needs to be regulated and controlled, so that the cold load output by the air conditioner is reduced under the condition that the compressor is not stopped, the indoor temperature is maintained in a comfortable temperature range, and the use feeling of the user is improved.
In this embodiment, it is to be noted that, referring to fig. 3, a high-temperature and high-pressure gaseous refrigerant is conveyed to 2, and is converted into a medium-temperature and low-pressure liquid refrigerant after heat dissipation in 2, then the medium-temperature and low-pressure liquid refrigerant is throttled and depressurized by 3 to become a low-temperature and low-pressure gas-liquid mixed refrigerant, and then gas-liquid separation is performed on the gas-liquid mixed refrigerant by 4, the separated gaseous refrigerant directly flows back to 1 to be continuously circulated for refrigeration, and the separated liquid refrigerant flows to 6 via 5 to be evaporated within absorbing heat in 6 to become a gaseous refrigerant, that is, the refrigerant flowing out from the outdoor heat exchanger does not completely flow into the indoor heat exchanger, but a part of the gaseous refrigerant directly flows back to the compressor via the flash evaporator, and another part of the liquid refrigerant flows into the indoor heat exchanger to be evaporated and absorbed.
Based on the structure of the air conditioner, in this embodiment, when it is detected that the indoor temperature needs to be prevented from continuously decreasing, the opening degree of the electronic expansion valve between the outdoor heat exchanger and the flash evaporator can be increased to decrease the pressure of the refrigerant therebetween, thereby decreasing the output cooling load of the air conditioner, that is, increasing the overall outlet air temperature of the air conditioner, and in addition, the opening degree of the electronic expansion valve between the flash evaporator and the indoor heat exchanger can be decreased to decrease the flow rate of the refrigerant flowing into the indoor heat exchanger (i.e., the evaporator), thereby decreasing the cooling capacity output by the indoor heat exchanger, thereby ensuring that the indoor temperature does not continuously decrease under the condition of not stopping the compressor, and in addition, decreasing the opening degree of the electronic expansion valve between the flash evaporator and the indoor heat exchanger can also decrease the risks of liquid return and abnormal sounds generated during the low-frequency operation of the compressor, thereby, by performing the cooperative adjustment on, the risk of reducing liquid return and abnormal sound when realizing improving the air-out temperature of indoor temperature air conditioner, reinforcing system reliability, and then reach the purpose that promotes user's travelling comfort.
In addition, in an application scene, the opening degree of the electronic expansion valve between the outdoor heat exchanger and the flash evaporator can be increased firstly, and then when the second sensor detects that the low pressure of the air conditioner does not meet the low pressure condition in the current normal operation or the second sensor detects that the high pressure of the air conditioner does not meet the high pressure condition in the current normal operation, the opening degree of the electronic expansion valve between the flash evaporator and the indoor heat exchanger is reduced, so that when the indoor temperature is controlled not to continuously decrease any more, the fluctuation range of the indoor temperature is ensured to be within the stable fluctuation range, and the comfort of a user is improved.
Further, in an embodiment, when the electronic expansion valve is adjusted, in order to avoid that the amplitude of the opening adjustment of the electronic expansion valve is too large, which results in a large fluctuation amplitude of the indoor temperature difference, in this embodiment, the opening of the first electronic expansion valve is increased in a stepwise manner, and the opening of the second electronic expansion valve is decreased in a stepwise manner until the indoor temperature of the indoor environment where the air conditioner is located is equal to the set temperature.
Specifically, in this step, the step-by-step manner refers to gradual adjustment, and the step-by-step manner refers to gradual adjustment, that is, the opening degrees of the two electronic expansion valves may be adjusted step by using a periodic regulation manner, and the indoor temperature of the indoor environment where the air conditioner is located may be monitored at any time, for example, the opening degree of the first electronic expansion valve is increased by the minimum unit opening degree every 30s, the opening degree of the first electronic expansion valve is decreased by the minimum unit opening degree every 30s, and the indoor temperature of the indoor environment where the air conditioner is located is monitored at the same time, and the adjustment of the opening degrees of the two electronic expansion valves may be stopped until the indoor temperature reaches the set temperature of.
Further, in another embodiment, when the indoor temperature of the indoor environment where the air conditioner is located is less than the set temperature and the opening degree of the second electronic expansion valve reaches the minimum limit opening degree, the opening degree of the first electronic expansion valve is reduced, so that the flow rate of the refrigerant flowing into the indoor heat exchanger is reduced by reducing the flow rate of the refrigerant flowing out of the outdoor heat exchanger, and the output cold load of the air conditioner is more matched with the actual demand.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and those skilled in the art can make settings based on needs in practical applications, and the settings are not listed here.
In this embodiment, when detecting the cold load of air conditioner output and surpassing the cold load that the user required, from this through reducing the refrigerant pressure between outdoor heat exchanger and the flash vessel and reducing the refrigerant flow between flash vessel and the indoor heat exchanger, make the liquid refrigerant that gets into indoor heat exchanger reduce, so that the actual demand is more matchd to air conditioner output cold load, thereby it is stable to ensure that the compressor of air conditioner maintains indoor temperature under the state of not shutting down, reduce the risk of returning liquid simultaneously, the reinforcing system reliability, and then reach the purpose that promotes user's travelling comfort.
Further, a second embodiment of the control method of the air conditioner of the present invention is proposed based on the first embodiment of the control method of the air conditioner of the present invention.
Referring to fig. 4, fig. 4 is a flowchart illustrating a control method of an air conditioner according to a second embodiment of the present invention;
the difference between the second embodiment and the first embodiment is that step S30 further includes:
step 3201: the opening degree of the first electronic expansion valve is increased by a first target opening degree, and the opening degree of the second electronic expansion valve is decreased by a second target opening degree.
Step S302: and after the preset time, returning to the step of judging whether the indoor temperature of the indoor environment where the air conditioner is located reaches the preset indoor temperature condition.
In this step, the two target opening degrees may be the same or different, for example, one opening degree is increased by m and the other opening degree is decreased by m, or one opening degree is increased by m and the other opening degree is decreased by n, which is not limited in this embodiment.
Further, in order to maintain the stable operation of the air conditioner, after the two electronic expansion valves are regulated and controlled, and after a preset time, whether the indoor temperature of the indoor environment where the air conditioner is located reaches a preset indoor temperature condition is judged; and when the indoor temperature of the indoor environment where the air conditioner is located reaches a preset indoor temperature condition, returning to execute the steps of increasing the opening degree of the first electronic expansion valve by a first target opening degree and decreasing the opening degree of the second electronic expansion valve by a second target opening degree, so that the air conditioner is always in a stable running state during running through cyclic regulation and control, and the experience of a user is improved.
In addition, during the cyclic adjustment, the adjustment range of the opening degree may be gradually increased, which is exemplified herein by the opening degree increasing direction, for example, when the temperature difference between the indoor temperature and the set temperature is detected to be too large, the opening degree is increased by 1p, then the adjustment condition is detected again, and then the opening degree is increased by 1p, and so on, and the opening degree decreasing direction is the same as the opening degree increasing direction, which is not described herein again, so that the temperature adjustment efficiency is improved by the above adjustment and control method.
Further, in order to improve the accuracy of opening degree regulation, in this embodiment, when the electronic expansion valve is regulated, the size of the opening degree to be regulated is determined by combining the current operating parameters of the air conditioner, specifically, before the regulation, the target pressure difference of the air conditioner and the current operating frequency of the compressor need to be acquired, and then the first target opening degree and the second target opening degree are determined according to the target pressure difference and the current operating frequency.
It should be noted that, the above-mentioned differential pressure refers to the differential pressure between the high pressure and the low pressure of the system, in this embodiment, the differential pressure can be obtained by using the pressures measured by the above-mentioned first sensor and the second sensor.
It should be noted that, during the cycle adjustment, when the indoor temperature is within the set temperature range, in other words, when the indoor temperature does not reach the preset indoor temperature condition, the air conditioner can maintain the current operation state and continue to operate until entering the next cycle operation.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and those skilled in the art can make settings based on needs in practical applications, and the settings are not listed here.
In this embodiment, the opening degree of the first electronic expansion valve is increased by the first target opening degree, the opening degree of the second electronic expansion valve is decreased by the second target opening degree, and after a preset time, the step of determining whether the indoor temperature of the indoor environment where the air conditioner is located is lower than the set temperature is performed, so that the electronic expansion valve is regulated and controlled in a circulation regulation manner, the air conditioner is always in a stable operation state during operation, and the user comfort is further improved.
Further, a third embodiment of the control method of the air conditioner of the present invention is proposed based on the first embodiment of the control method of the air conditioner of the present invention.
Referring to fig. 5, fig. 5 is a flowchart illustrating a control method of an air conditioner according to a second embodiment of the present invention;
the third embodiment is different from the first embodiment in that after step S30, the method further includes:
step S401: acquiring the outdoor temperature of the outdoor environment where the current air conditioner is located and the indoor temperature of the indoor environment where the current air conditioner is located;
step S402: determining a target exhaust temperature interval according to the outdoor temperature and the indoor temperature;
step S403: and when the exhaust temperature of the compressor is not in the target exhaust temperature interval, adjusting the opening degree of the first electronic expansion valve and/or the second electronic expansion valve until the exhaust temperature of the compressor is in the target exhaust temperature interval.
It should be noted that, in this embodiment, at each indoor and outdoor temperature, there is a control coefficient between the operation frequency of a corresponding one of the compressors and the exhaust temperature, so that when the air conditioner operates at the control coefficient, the operation state of the air conditioner is optimal, in other words, the current exhaust temperature needs to be within the exhaust temperature range matched with the target operation frequency corresponding to the temperature of the outdoor environment where the air conditioner is located and the indoor temperature of the indoor environment where the air conditioner is located.
In this embodiment, the outdoor temperature may be divided into M outdoor temperature intervals, the indoor temperature may be divided into N indoor temperature intervals, and each of the outdoor temperature intervals — the indoor temperature region corresponds to a preset operation frequency value, for example, the outdoor temperature is divided into 3 outdoor temperature intervals: t isOuter cover≤a、a<TOuter cover<b and TOuter coverB, dividing the indoor temperature T1 into 3 indoor temperature intervals TInner part≤c、c<TInner part<d and TInner partAnd d is more than or equal to d, namely nine indoor temperature intervals are formed, each temperature interval corresponds to one target operation frequency, and each target operation frequency corresponds to one target exhaust temperature interval.
Therefore, in this embodiment, the outdoor temperature of the outdoor environment where the air conditioner is currently located and the indoor temperature of the indoor environment where the air conditioner is currently located are obtained, the target operation frequency is determined according to the rule, the target exhaust temperature interval is determined according to the target operation frequency, and finally the opening degree of the electronic expansion valve of the air conditioner is adjusted.
Further, when the discharge temperature of the compressor exceeds the above-described target discharge temperature interval, there may be two cases:
the first method comprises the following steps: the exhaust temperature of the compressor is greater than the maximum exhaust temperature in the target exhaust temperature interval;
in this embodiment, when the discharge temperature of the compressor is in such a condition, which may be caused by an excessively small refrigerant flow rate in the refrigeration circuit of the air conditioner, the opening degree of the first electronic expansion valve may be increased, so that the discharge temperature of the compressor may be decreased by increasing the refrigerant flow rate in the refrigeration circuit of the air conditioner.
In another embodiment, the air conditioner may further reduce the discharge temperature of the compressor by increasing the opening degree of the second electronic expansion valve due to a small amount of refrigerant in the indoor heat exchanger.
Further, in order to make the current exhaust temperature need to be within the target exhaust temperature interval rapidly, the opening degree of the first electronic expansion valve may be gradually increased, and the opening degree of the second electronic expansion valve may be gradually increased at the same time until the exhaust temperature of the compressor is within the target exhaust temperature interval.
It should be noted that, when the two electronic expansion valves are adjusted step by step, the adjustment and control range may be the same each time, for example, 1p is increased first, when the air conditioner is stable in operation and the adjustment and control condition is reached by re-detection, 1p is increased on the basis of the current opening degree, so that the exhaust temperature is gradually in the target exhaust temperature range by small-range adjustment.
It should be noted that, when the opening degree of the second electronic expansion valve is adjusted, the flow rate of the refrigerant flowing into the indoor heat exchanger is changed, and the cooling capacity output by the indoor heat exchanger is further changed, therefore, in this embodiment, the opening degree of the first electronic expansion valve may be increased, and whether the exhaust temperature of the compressor exceeds the target exhaust temperature interval is detected in real time, when the opening degree of the first electronic expansion valve reaches the maximum limit opening degree and the exhaust temperature of the compressor is still in this condition, the exhaust temperature of the compressor is reduced by increasing the opening degree of the second electronic expansion valve, thereby ensuring that the exhaust temperature is in the target exhaust temperature interval without affecting the indoor temperature.
And the second method comprises the following steps: the exhaust temperature of the compressor is less than the minimum exhaust temperature in the target exhaust temperature interval;
in this embodiment, when the discharge temperature of the compressor is in such a condition, which may be caused by an excessive flow rate of the refrigerant in the refrigeration circuit of the air conditioner, the opening degree of the first electronic expansion valve may be decreased, so that the discharge temperature of the compressor may be increased by decreasing the flow rate of the refrigerant in the refrigeration circuit of the air conditioner.
In another embodiment, the refrigerant in the indoor heat exchanger of the air conditioner may be too much, so the exhaust temperature of the compressor may be increased by reducing the opening degree of the second electronic expansion valve.
Further, in order to make the current exhaust temperature need to be within the target exhaust temperature interval rapidly, the opening degree of the first electronic expansion valve may be gradually decreased, and the opening degree of the second electronic expansion valve may be gradually decreased at the same time until the exhaust temperature of the compressor is within the target exhaust temperature interval, where the step of gradually adjusting the two electronic expansion valves is the same as the step of gradually adjusting in the first case, and is not repeated here.
In addition, as in the first case, when the opening degree of the second electronic expansion valve is adjusted, the flow rate of the refrigerant flowing into the indoor heat exchanger is changed, and thus the cooling capacity output by the indoor heat exchanger is changed, so in this embodiment, the opening degree of the first electronic expansion valve may be first reduced, and when the opening degree of the first electronic expansion valve reaches the minimum limit opening degree and the discharge temperature of the compressor is still in this state, the discharge temperature of the compressor may be increased by reducing the opening degree of the second electronic expansion valve, thereby ensuring that the discharge temperature is within the target discharge temperature range without affecting the indoor temperature.
In this embodiment, when the two electronic expansion valves are regulated, the electronic expansion valve of the air conditioner is secondarily adjusted according to the target exhaust temperature interval matching the outdoor temperature and the indoor temperature, so as to ensure that the compressor of the air conditioner is in a non-stop state, and thus the operation state of the air conditioner is optimal.
Further, a fifth embodiment of the control method of the air conditioner of the present invention is proposed based on the first embodiment of the control method of the air conditioner of the present invention.
Referring to fig. 6, fig. 6 is a flowchart illustrating a control method of an air conditioner according to a second embodiment of the present invention;
the fifth embodiment is different from the first embodiment in that, after step S30, the method further includes:
step S501: acquiring indoor temperature change parameters of an indoor environment where the air conditioner is located within preset time;
step S502: and if the indoor temperature change parameter does not reach the preset indoor temperature change parameter condition, controlling a fresh air fan of the air conditioner to start and operate.
It should be noted that the indoor temperature variation parameter refers to an indoor temperature variation trend, that is, when the indoor temperature variation trend is a descending trend, the fresh air function of the air conditioner is turned on.
The indoor temperature variation trend may be determined according to a temperature difference between an indoor temperature at a start time point and an indoor temperature at a stop time point of the time period, or may be determined according to an indoor temperature at each time point within a preset time.
For convenience of understanding, this embodiment illustrates that, for example, after the opening degree is adjusted, when it is detected that the air conditioner is in a stable operation period, the current indoor temperature is obtained to be 22 ℃, and then the indoor temperature is measured again to be 21 ℃ at an interval of 60s, that is, it indicates that the current indoor temperature is in a downward trend, it indicates that the fresh air function needs to be started to neutralize the cooling capacity of the air conditioner by using the outdoor temperature with a higher temperature.
It should be further noted that, when the fresh air function of the air conditioner is started, in order to improve the regulation and control effect, the operation parameters of the fresh air machine need to be determined by combining the environment temperature of the environment where the air conditioner is located.
In the step, the fresh air machine is started only when the outdoor environment temperature is detected to be higher than the indoor environment temperature, and in addition, the opening degree and the rotating speed of the electronic expansion valve of the fresh air machine can be determined according to the indoor and outdoor environment temperature difference and the current operating frequency of the air conditioner when the fresh air machine is started.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and those skilled in the art can make settings based on needs in practical applications, and the settings are not listed here.
In this embodiment, acquire the indoor temperature variation parameter of the indoor environment that the air conditioner was located in the time of predetermineeing to when the indoor temperature variation parameter did not reach the indoor temperature variation parameter condition of predetermineeing, the new fan start-up operation of control air conditioner from this introduces the higher outdoor temperature of temperature through starting new fan and comes the refrigerating output of neutralization air conditioner, and then reaches the purpose of maintaining user's travelling comfort.
In addition, the embodiment also provides a control device of the air conditioner. Referring to fig. 7, fig. 7 is a functional block diagram of a control device of an air conditioner according to an embodiment of the present invention.
Specifically, referring to fig. 7, the control apparatus of the air conditioner includes:
an obtaining module 10, configured to obtain a current operating frequency of the compressor when the air conditioner is in a cooling mode;
it should be noted that the operation frequency of the compressor of the air conditioner may be monitored in real time when the air conditioner performs a cooling operation, or the operation frequency of the compressor of the air conditioner may be obtained again when the operation state of the air conditioner reaches a certain state, so as to reduce the power consumption of the air conditioner.
A judging module 20, configured to judge whether an indoor temperature of an indoor environment where the air conditioner is located is less than a set temperature when the current operating frequency reaches a minimum limit frequency; and the number of the first and second groups,
it should be noted that, in order to ensure the normal operation of the air conditioner, the compressor should be within a safe frequency range during operation, so the minimum limit frequency in this embodiment may refer to the minimum frequency within the safe frequency range of the current air conditioner, and may also refer to other frequencies within the safe frequency range of the air conditioner, which is not limited herein.
In this step, in order to avoid the air conditioner performing the warm-up shutdown operation, in this embodiment, the indoor temperature needs to be monitored, so as to determine whether the operation parameter of the air conditioner needs to be adjusted according to the indoor temperature, in other words, when it is detected that the indoor temperature is lower than the set temperature, it indicates that the electronic expansion valve opening of the air conditioner needs to be adjusted, that is, the first electronic expansion valve opening is increased, and the second electronic expansion valve opening is decreased.
In addition, in order to avoid that the difference between the indoor temperature and the temperature set by the user is greater than or equal to the temperature difference set by the user and the indoor temperature is less than the temperature set by the user, the control time interval of the electronic expansion valve is delayed in this embodiment to maintain the indoor temperature stable within the temperature range acceptable by the user, for example, the temperature fluctuation range set by the user is 2 ℃, the indoor temperature of the indoor environment of the air conditioner is 22 ℃ and the temperature set by the user is 26 ℃, that is, the temperature difference between the two is 4 ℃, the operation parameter of the air conditioner needs to be adjusted, and when the indoor temperature of the indoor environment of the air conditioner is 25 ℃, the temperature difference between the two is 1 ℃ and indicates that the temperature is within the temperature range acceptable by the user, no adjustment of the operating parameters of the air conditioner is necessary.
In addition, in order to improve the regulation and control accuracy of the air conditioner, whether the conditions are met or not is detected according to the indoor temperature change trend, specifically, the indoor environment temperature of the outdoor environment where the air conditioner is located, the change trend of the indoor environment temperature and the set temperature of the air conditioner are obtained, after the indoor environment temperature is detected to be lower than the set temperature, the indoor environment temperature can be obtained in real time or periodically within the preset time, and the indoor environment temperature can be marked sequentially. For example, the indoor ambient temperatures T1, T2, T3 Tn can be obtained and labeled sequentially. Where Tn is the indoor environment temperature obtained at the nth time in the obtaining period, and the time interval between the first time and the second time may be set according to actual conditions, for example, the time interval may be set to 30 s.
Further, in this embodiment, after the indoor ambient temperatures T1, T2, and T3 to Tn are periodically obtained, the indoor temperature curves corresponding to the indoor ambient temperatures T1, T2, and T3 to Tn are generated, and finally, the variation trend of the indoor ambient temperature is determined according to the variation trend of the indoor temperature curves.
Further, in still another embodiment, when the trend of change of the indoor ambient temperature acquired within the above-mentioned preset time is not fixed, namely, the change trend of the indoor temperature curve within the preset time has the rising trend and the falling trend, the last section of the indoor temperature curve changes as the change trend of the indoor environment temperature, for example, 10 indoor environment temperatures are periodically obtained within 5 minutes, the curve trend of the first 2 minutes is in an increasing trend, the curve trend of the middle 1 minute is in a steady trend, and the curve trend of the last 3 minutes is in a decreasing trend after the indoor temperature curves corresponding to the 10 indoor environment temperatures are generated, judging the trend of the change trend of the indoor environment temperature to be lower, when the indoor environment temperature is detected to be lower than the set temperature, and when the variation trend of the indoor environment temperature is in a descending trend, the opening degree of the electronic expansion valve of the air conditioner needs to be adjusted.
In an application scenario, when the indoor temperature is greater than or equal to the set temperature, or is less than the set temperature, but the difference between the indoor temperature and the user-set temperature is less than the user-set temperature difference, or is less than the set temperature, but the trend of the change of the indoor environment temperature is up-down, it indicates that the adjustment of the opening of the electronic expansion valve of the air conditioner is not needed currently, the air conditioner continues to operate at the current opening of the electronic expansion valve, and after operating for a period of time, the step of obtaining the current operating frequency of the compressor is repeatedly executed again, and the subsequent steps are continuously executed, which is not described herein again.
And the regulation and control module 30 is configured to increase an opening degree of the first electronic expansion valve and decrease an opening degree of the second electronic expansion valve when an indoor temperature of an indoor environment where the air conditioner is located is less than a set temperature, so as to reduce a refrigerant pressure between the outdoor heat exchanger and the flash evaporator and decrease a refrigerant flow rate at the indoor heat exchanger.
In this embodiment, when the above condition is reached, it indicates that the cooling load output by the air conditioner currently exceeds the cooling load required by the user, that is, it indicates that the operation parameter of the air conditioner needs to be adjusted and controlled, so as to ensure that the cooling load output by the air conditioner is reduced under the condition that the compressor is not stopped, so that the indoor temperature is maintained in a comfortable temperature range, and further improve the user experience.
Based on the structure of the air conditioner, in this embodiment, when it is detected that the indoor temperature needs to be prevented from continuously decreasing, the opening degree of the electronic expansion valve between the outdoor heat exchanger and the flash evaporator can be increased to reduce the pressure of the refrigerant therebetween, so as to reduce the output cooling load of the air conditioner, and in addition, the opening degree of the electronic expansion valve between the flash evaporator and the indoor heat exchanger can be simultaneously reduced to reduce the flow rate of the refrigerant flowing into the indoor heat exchanger (i.e., the evaporator), so as to reduce the refrigerating capacity output by the indoor heat exchanger, thereby ensuring that the indoor temperature is maintained not to continuously decrease under the condition that the compressor is not stopped.
In addition, in an application scene, the opening degree of the electronic expansion valve between the outdoor heat exchanger and the flash evaporator can be increased firstly, and then when the second sensor detects that the low pressure of the air conditioner does not meet the low pressure condition in the current normal operation or the second sensor detects that the high pressure of the air conditioner does not meet the high pressure condition in the current normal operation, the opening degree of the electronic expansion valve between the flash evaporator and the indoor heat exchanger is reduced, so that when the indoor temperature is controlled not to continuously decrease any more, the fluctuation range of the indoor temperature is ensured to be within the stable fluctuation range, and the comfort of a user is improved.
Further, in an embodiment, when the electronic expansion valve is adjusted, in order to avoid that the amplitude of the opening adjustment of the electronic expansion valve is too large, which results in a large fluctuation amplitude of the indoor temperature difference, in this embodiment, the opening of the first electronic expansion valve is increased in a stepwise manner, and the opening of the second electronic expansion valve is decreased in a stepwise manner until the indoor temperature of the indoor environment where the air conditioner is located is equal to the set temperature.
Specifically, in this step, the step-by-step manner refers to gradual adjustment, and the step-by-step manner refers to gradual adjustment, that is, the opening degrees of the two electronic expansion valves may be adjusted gradually by a periodic regulation manner, and the indoor temperature of the indoor environment where the air conditioner is located may be monitored at any time, for example, the opening degree of the first electronic expansion valve may be increased by the minimum unit opening degree every 30s, the opening degree of the first electronic expansion valve may be decreased by the minimum unit opening degree every 30s, and the adjustment of the opening degrees of the two electronic expansion valves may be stopped while monitoring the indoor temperature of the indoor environment where the air conditioner is located until the indoor temperature reaches the set temperature of the user.
Further, in another embodiment, when the indoor temperature of the indoor environment where the air conditioner is located is less than the set temperature and the opening degree of the second electronic expansion valve reaches the minimum limit opening degree, the opening degree of the first electronic expansion valve is reduced, so that the flow rate of the refrigerant flowing into the indoor heat exchanger is reduced by reducing the flow rate of the refrigerant flowing out of the outdoor heat exchanger, and the output cold load of the air conditioner is more matched with the actual demand.
In this embodiment, when detecting the cold load of air conditioner output and having surpassed the cold load that the user required, from this through reducing the refrigerant pressure between outdoor heat exchanger and the flash vessel and reducing the refrigerant flow between flash vessel and the indoor heat exchanger, make the liquid refrigerant that gets into indoor heat exchanger reduce, so that the actual demand is more matchd to air conditioner output cold load, thereby it is stable to ensure that the compressor of air conditioner maintains indoor temperature under the state that does not shut down, reduce the risk of returning liquid simultaneously, the reinforcing system reliability, and then reach the purpose that promotes user's travelling comfort.
In addition, an embodiment of the present invention further provides a computer storage medium, where a control program of an air conditioner is stored on the computer storage medium, and when the control program of the air conditioner is executed by a processor, the steps of the control method of the air conditioner are implemented, which are not described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on this understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/R1M, magnetic disk, optical disk) as described above and includes instructions for causing a terminal device to execute the methods according to the embodiments of the present invention.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structures or flow transformations made by the present specification and drawings, or applied directly or indirectly to other related arts, are included in the scope of the present invention.

Claims (10)

1. The control method of the air conditioner is characterized in that the air conditioner comprises a compressor, an outdoor heat exchanger, a flash evaporator and an indoor heat exchanger which are sequentially connected, wherein a first electronic expansion valve is arranged between the outdoor heat exchanger and the flash evaporator, a second electronic expansion valve is arranged between a liquid phase outlet of the flash evaporator and the indoor heat exchanger, the compressor comprises a first air cylinder and a second air cylinder which are mutually independent, a gas return port of the first air cylinder is communicated with the indoor heat exchanger, and a gas return port of the second air cylinder is communicated with a gas phase outlet of the flash evaporator; the method comprises the following steps:
when the air conditioner is in a refrigeration mode, acquiring the current running frequency of the compressor;
when the current operating frequency reaches the minimum limit frequency, judging whether the indoor temperature of the indoor environment where the air conditioner is located is lower than a set temperature; and the number of the first and second groups,
and when the indoor temperature of the indoor environment of the air conditioner is lower than the set temperature, increasing the opening degree of the first electronic expansion valve and reducing the opening degree of the second electronic expansion valve so as to reduce the pressure of the refrigerant between the outdoor heat exchanger and the flash evaporator and reduce the flow of the refrigerant at the indoor heat exchanger.
2. The control method of an air conditioner according to claim 1, wherein the step of increasing the opening degree of the first electronic expansion valve and decreasing the opening degree of the second electronic expansion valve comprises:
increasing the opening degree of the first electronic expansion valve by a first target opening degree, and decreasing the opening degree of the second electronic expansion valve by a second target opening degree;
and after the preset time, returning to the step of judging whether the indoor temperature of the indoor environment where the air conditioner is located is less than the set temperature.
3. The method of controlling an air conditioner according to claim 2, wherein before the step of increasing the opening degree of the first electronic expansion valve by a first target opening degree and decreasing the opening degree of the second electronic expansion valve by a second target opening degree, the method further comprises:
acquiring a target pressure difference of the air conditioner and the current operating frequency of the compressor;
and determining a first target opening degree and a second target opening degree according to the target pressure difference and the current operation frequency.
4. The control method of an air conditioner according to claim 1, wherein the step of increasing the opening degree of the first electronic expansion valve and decreasing the opening degree of the second electronic expansion valve comprises:
and increasing the opening degree of the first electronic expansion valve in a stepping mode, and decreasing the opening degree of the second electronic expansion valve in a stepping mode until the indoor temperature of the indoor environment where the air conditioner is located is equal to the set temperature.
5. The method for controlling an air conditioner according to claim 1, wherein after the step of determining whether the indoor temperature of the indoor environment in which the air conditioner is located is less than the set temperature, the method further comprises:
and when the indoor temperature of the indoor environment where the air conditioner is located is greater than or equal to the set temperature, controlling the air conditioner to continuously operate according to the current operation parameters.
6. The method of claim 1, wherein the step of increasing the opening degree of the first electronic expansion valve and decreasing the opening degree of the second electronic expansion valve is followed by the step of:
and when the indoor temperature of the indoor environment where the air conditioner is located is lower than the set temperature and the opening degree of the second electronic expansion valve reaches the minimum limiting opening degree, reducing the opening degree of the first electronic expansion valve.
7. The method for controlling an air conditioner according to any one of claims 1 to 6, further comprising, after the steps of increasing the opening degree of the first electronic expansion valve and decreasing the opening degree of the second electronic expansion valve when the indoor temperature of the indoor environment in which the air conditioner is located reaches a preset indoor temperature condition:
acquiring the outdoor temperature of the outdoor environment where the current air conditioner is located and the indoor temperature of the indoor environment where the current air conditioner is located;
determining a target exhaust temperature interval according to the outdoor temperature and the indoor temperature;
and when the exhaust temperature of the compressor exceeds the target exhaust temperature interval, adjusting the opening degree of the first electronic expansion valve and/or the second electronic expansion valve until the exhaust temperature of the compressor is in the target exhaust temperature interval.
8. A control apparatus of an air conditioner, comprising:
the acquisition module is used for acquiring the current running frequency of the compressor when the air conditioner is in a refrigeration mode;
the judging module is used for judging whether the indoor temperature of the indoor environment where the air conditioner is located is lower than a set temperature or not when the current running frequency reaches the minimum limit frequency; and the number of the first and second groups,
and the regulation and control module is used for increasing the opening degree of the first electronic expansion valve and reducing the opening degree of the second electronic expansion valve when the indoor temperature of the indoor environment where the air conditioner is located is lower than a set temperature, so as to reduce the pressure of the refrigerant between the outdoor heat exchanger and the flash evaporator and reduce the flow of the refrigerant at the indoor heat exchanger.
9. An air conditioner, characterized in that the air conditioner comprises a processor, a memory and a control program of the air conditioner stored in the memory, and the control program of the air conditioner, when executed by the processor, implements the steps of the control method of the air conditioner according to any one of claims 1 to 7.
10. A computer storage medium, characterized in that the computer storage medium has stored thereon a control program of an air conditioner, which when executed by a processor implements the steps of the control method of the air conditioner according to any one of claims 1 to 7.
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CN114688702A (en) * 2022-04-27 2022-07-01 美的集团武汉暖通设备有限公司 Control method and control device of air conditioner and air conditioner
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